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Re: Need help to convert

From "Roedy Green" <roedy.green@THRWHITE.remove-dii-this>
Subject Re: Need help to convert
Message-ID <mlt2s39rl8j9c813n610felfcm0vs2qn13@4ax.com> (permalink)
Newsgroups comp.lang.java.gui
References <cfbd828c-f3af-4995-bfa8-f38698468402@m23g2000hsc.googlegroups.com>
Date 2011-04-27 15:43 +0000
Organization TDS.net

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  To: comp.lang.java.gui
On Sat, 23 Feb 2008 20:46:10 -0800 (PST), Katak
<vampireex@hotmail.com> wrote, quoted or indirectly quoted someone who
said :

>   double exponent = Math.pow(2, power);
>         result += ((bin.charAt(i) - 48) * (exponent));
>         power++;

Shift would be more accurate and much much faster.

power = 1;
...
power <<= 1;

or even better just shift (bin.charAt(i) - '0') directly by i.

see http://mindprod.com/jgloss/shift.html
http://mindprod.com/jgloss/binary.html
http://mindprod.com/jgloss/precedence.html
http://mindprod.com/jgloss/bit.html
http://mindprod.com/jgloss/masking.html
--

Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com

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Thread

Re: Need help to convert "Katak" <katak@THRWHITE.remove-dii-this> - 2011-04-27 15:43 +0000
  Re: Need help to convert "Jeff Higgins" <jeff.higgins@THRWHITE.remove-dii-this> - 2011-04-27 15:43 +0000
    Re: Need help to convert "Roedy Green" <roedy.green@THRWHITE.remove-dii-this> - 2011-04-27 15:43 +0000
      Re: Need help to convert "Katak" <katak@THRWHITE.remove-dii-this> - 2011-04-27 15:43 +0000
        Re: Need help to convert "Roedy Green" <roedy.green@THRWHITE.remove-dii-this> - 2011-04-27 15:43 +0000
    Re: Need help to convert "Katak" <katak@THRWHITE.remove-dii-this> - 2011-04-27 15:43 +0000
      Re: Need help to convert "Roedy Green" <roedy.green@THRWHITE.remove-dii-this> - 2011-04-27 15:43 +0000
        Re: Need help to convert "tar" <tar@THRWHITE.remove-dii-this> - 2011-04-27 15:43 +0000
  Re: Need help to convert "Roedy Green" <roedy.green@THRWHITE.remove-dii-this> - 2011-04-27 15:43 +0000

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